mineral

Polished turquoise cabochon

Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

AI-generated identification · may be incorrect

Typically Mohs hardness 5–6, opaque blue to blue-green, waxy to subvitreous luster, cryptocrystalline structure, and no visible cleavage. Brown-black matrix and small metallic-looking flecks are consistent with natural host-rock inclusions, though dyeing or stabilization cannot be ruled out from a photo.

Identified August 26, 2026More mineral →

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At a glance

Common name: Polished turquoise cabochon
Scientific name: Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small common stabilized cabochon; $50–$300+ for attractive natural, untreated material, with exceptional provenance commanding much more.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms as a secondary mineral in arid, oxidized copper deposits when phosphate-bearing groundwater alters aluminum-rich rock; most deposits are Cenozoic to younger. Major sources include Iran, Arizona and Nevada, Mexico, China, and Tibet.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; historically valued in jewelry and ceremonial arts. Lower-grade material is commonly stabilized with resin to improve durability.

Geological facts

Turquoise’s blue color comes mainly from copper, while greener hues reflect iron or dehydration. It commonly occurs with limonite, iron oxides, or dark host-rock matrix.

Field identification & locations

Identify by its opaque blue-green color, relatively low hardness, waxy luster, and porous feel; it should not scratch glass reliably. Natural turquoise is often irregularly patterned, while uniform color may indicate treatment or imitation.